That leaf looks very much like my bat plant, which is in the orchid family. Google Tacca Chantrieri, it's scientific name, and see if this is your plant. Beautiful and strange flowers if given the right conditions, it needs lots of water and filtered sun. Should never dry out and that is what looks like happened to these leaves.

Now I'm puzzled as to why you asked for an id (using a photo dated 2015) if you already knew its name and had posted about it before? Your plant hasn't got typical Ixora foliage which is why I didn't recognise it. I'm thinking it could be Ixora 'Siam Ribbon' which has curled and distorted foliage. Reading up on its requirements I doubt it will flower in a terrarium as it likes full sun. Siam Ribbon

First one could be a Hoya. I'm more used to seeing the ponytail palm (it's not a palm btw) as a single plant per pot, you might want to consider potting on individually, or not, whatever floats your boat!

No, that's a Cordyline Australis. More of an outdoor than indoor plant.